I blundered into a deal for 10 100rd boxes of these guys. I figure I can sell 500 of them. Hornady #40060 .400" for 40 S&W/10MM. $30/100.
I should be able to fit up to 500 in a small flat rate box for $9 shipping if you don't want the original packaging. If you want the boxes, it will be $14. I'm in Kent, WA